1 Powerbank, of 1500 mAh capacity, 3.7 volt.
For your MetaBird it can be used as a nomad charger. It will allows more than 10 recharges outdoor. All you have to do is plug the MetaBird charger into it, like into a USB port.
*For your MetaFly standard (it is included already in the upgrade kit) It must be used in combination with the USB Charger, so it is best to buy the complete kit here.